如何转换 RoleViewModel 列表中的匿名列表？

Question

在我的操作方法中，我 运行 以下查询 returns 一个列表：

var list = db.WorkRoles.
                Join(db.WorkRolesUsersDetails,
                o => o.WorkRoleId, od => od.WorkRoleId,
                (o, od) => new
                {
                    WorkRoleId = o.WorkRoleId,
                    RoleName = o.RoleName,
                    RoleDescription = o.RoleDescription,
                    CompanyId = o.CompanyId,
                    WRUDId = od.WRUDId,
                    UserDetailsId = od.UserDetailsId,
                    FocusStart = od.FocusStart,
                    FocusEnd = od.FocusEnd
                }).ToList();

我有一个格式相同的 viemodel，如下所示：

public class RoleViewModel
{
    public RoleViewModel(int workRoleId, string roleName, string roleDescription, int companyId, int wRUDId, string userDetailsId, DateTime focusStart, DateTime focusEnd)
    {
        WorkRoleId = workRoleId;
        RoleName = roleName;
        RoleDescription = roleDescription;
        CompanyId = companyId;
        WRUDId = wRUDId;
        UserDetailsId = userDetailsId;
        FocusStart = focusStart;
        FocusEnd = focusEnd;
    }
    int WorkRoleId { get; set; }
    string RoleName  { get; set; }
    string RoleDescription { get; set; }
    int CompanyId { get; set; }
    int WRUDId { get; set; }
    string UserDetailsId { get; set; }
    DateTime FocusStart { get; set; }
    DateTime FocusEnd { get; set; }
}

将查询结果转换为视图模型列表的最佳方法是什么？

Answer 1

如果您不想让操作方法识别视图模型类型，您可以尝试以下操作。

1. 在初始列表上使用 Select 并为每个项目构建 RoleViewModel。

2. 使用 AutoMapper 库来完成这项工作。

   var list = db.WorkRoles. Join(db.WorkRolesUsersDetails, o => o.WorkRoleId, od => od.WorkRoleId, (o, od) => new { WorkRoleId = o.WorkRoleId, RoleName = o.RoleName, RoleDescription = o.RoleDescription, CompanyId = o.CompanyId, WRUDId = od.WRUDId, UserDetailsId = od.UserDetailsId, FocusStart = od.FocusStart, FocusEnd = od.FocusEnd }).ToList() .Select(item => new RoleViewModel( item.WorkRoleId, item.RoleName, item.RoleDescription, item.CompanyId, item.WRUDId, item.UserDetailsId, item.FocusStart, item.FocusEnd));

Answer 2

var list = db.WorkRoles.
            Join(db.WorkRolesUsersDetails,
            o => o.WorkRoleId, od => od.WorkRoleId,
            (o, od) => new RoleViewModel(
                o.WorkRoleId,
                o.RoleName,
                o.RoleDescription,
                o.CompanyId,
                od.WRUDId,
                od.UserDetailsId,
                od.FocusStart,
                od.FocusEnd
            )).ToList();